Mountain block



FIG. 1 is a front elevational view of a mountain block, showing my new design;

FIG. 2 is a left side elevational view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a rear elevational view thereof; and,

FIG. 5 is a top plan view thereof.

The bottom plan view is plain and unornamented. 

The ornamental design for a mountain block, as shown and described. 